CN103883287B - Offshore gas field low pressure natural gas recovery system - Google Patents
Offshore gas field low pressure natural gas recovery system Download PDFInfo
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- CN103883287B CN103883287B CN201410116454.5A CN201410116454A CN103883287B CN 103883287 B CN103883287 B CN 103883287B CN 201410116454 A CN201410116454 A CN 201410116454A CN 103883287 B CN103883287 B CN 103883287B
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Abstract
The invention discloses a kind of offshore gas field low pressure natural gas recovery system.In described offshore gas field low pressure natural gas recovery system, the gaseous phase outlet of high-pressure oil gas water separator is connected with residue gas compressor；The oil phase outlet of high-pressure oil gas water separator is connected with low pressure oil moisture trap；The gaseous phase outlet of low pressure oil moisture trap is connected with fuel system and wet gas compressor respectively；The oil phase outlet of low pressure oil moisture trap is connected with described condensate surge tank；Low pressure well head logistics from offshore gas field inputs to low pressure oil moisture trap or described condensate surge tank；The gaseous phase outlet of condensate surge tank is connected with low pressure gas cooler, low pressure gas cyclone, low pressure gas booster compressor and low pressure gas aftercooler successively.Offshore gas field low pressure natural gas recovery system of the present invention is mainly in offshore gas field, and pressure is relatively low or pressure-fired, natural gas gas that flow is less reclaim and utilizes, and reduces gas field emptying amount, it is achieved energy-saving and emission-reduction.
Description
Technical field
The present invention relates to a kind of offshore gas field low pressure natural gas recovery system.
Background technology
In the development process of Offshore Oil Industry, the main technological process of usual offshore gas field needs to configure following process system:
High-pressure separator, low pressure separator, condensate surge tank, wet gas compressor, TEG dehydration system, dry gas compress
Machine etc., as shown in Figure 1.This type of gas field is mainly to develop natural gas, and generally at the gas field development initial stage, well head comes
The pressure of logistics is higher, and after high-pressure separator, gaseous stream enters TEG dehydration system, the most again by dry
Carry out outer defeated after air compressor supercharging；Liquid phase and a small amount of gas phase enter back into low pressure separator after high-pressure separator,
Gas phase a part of direct feed fuels gas system after low pressure separator uses, and another part passes through wet gas compressor
Supercharging reaches the requirement of TEG dehydration system pressure, again by after residue gas compressor supercharging after TEG dehydration system
Carry out outer defeated；Liquid phase through low pressure separator enters condensate surge tank, through the isolated gas of condensate surge tank
Owing to pressure is relatively low, tolerance is less, then enter blowdown system and disposed by torch burning, through condensate surge tank
Liquid phase be transported to respective handling center by output pump and process.Owing to this type of gas field generally uses Self-spraying to exploit
Mode, in the later stage of gas field development, when the logistics that well head comes does not reaches the requirement of platform wet gas compressor inlet pressure,
Gas field development end cycle.Can draw through foregoing description, in Offshore Oil Industry is developed, use common process
Flow process develops the deficiency that there are two aspects for gas field: one is that the relatively small amount low pressure gas after condensate surge tank does not has
Can be utilized in time；Two is owing to wet gas compressor inlet pressure requirements is higher, have impact on the exploitation longevity of part gas well
Life.The requirement reduced discharging for response national energy-saving, needs to recycle the gas after condensate surge tank, simultaneously
For extend gas well construction cycle, improve gas field recovery ratio, need the gas of gas well lower pressure is developed and
Utilize.
Summary of the invention
It is an object of the invention to provide a kind of offshore gas field low pressure natural gas recovery system, present system is used for collecting sea
Low-pressure after condensate surge tank, the natural gas of low discharge in upper gas field, reduce the emptying tolerance of Oilfield Natural Gas Plant,
Realize the requirement of energy-saving and emission-reduction；On the other hand can extend the construction cycle of offshore gas field mesolow well, improve the warp in gas field
Ji benefit.
A kind of offshore gas field low pressure natural gas recovery system provided by the present invention, including high-pressure oil gas water separator, low
Force feed moisture trap, condensate surge tank, low pressure gas cooler, low pressure gas cyclone, low pressure gas booster compressor,
Low pressure gas aftercooler, residue gas compressor and fuel system；
The gaseous phase outlet of described high-pressure oil gas water separator is connected with described residue gas compressor；
The oil phase outlet of described high-pressure oil gas water separator is connected with described low pressure oil moisture trap；
The gaseous phase outlet of described low pressure oil moisture trap is connected with described fuel system and wet gas compressor respectively；
The oil phase outlet of described low pressure oil moisture trap is connected with described condensate surge tank；
Low pressure well head logistics from offshore gas field inputs to described low pressure gas oil gas water separator or described condensate slow
Rush in tank；The gaseous phase outlet of described condensate surge tank successively with described low pressure gas cooler, described low pressure gas cyclone,
Described low pressure gas booster compressor is connected with described low pressure gas aftercooler.
Above-mentioned offshore gas field low pressure natural gas recovery system, described high-pressure oil gas water separator and described residue gas compressor
Between connect a TEG dehydration system.
Above-mentioned offshore gas field low pressure natural gas recovery system, the outlet of described low pressure gas aftercooler is also three sweet with described
Dehydration of alcohols system is connected.
Above-mentioned offshore gas field low pressure natural gas recovery system, described low pressure gas booster compressor is twin-screw compressor,
Pressure-fired gas can be compressed, adapt to entrance tolerance and change greatly, single-stage pressure ratio can be realized high simultaneously, to realize
The recycling stable, long-term to low pressure gas, reduces the emptying amount of natural gas, it is achieved energy-saving and emission-reduction.
The offshore gas field low pressure natural gas recovery system that the present invention provides, described low pressure gas cooler will be described condensate
In surge tank, isolated natural gas is cooled to 40 DEG C, meets the requirement of described low pressure gas booster compressor inlet temperature；
Described low pressure gas cyclone can remove the moisture in low pressure natural gas or other impurity.
Offshore gas field low pressure natural gas recovery system of the present invention mainly in offshore gas field, pressure is relatively low or pressure-fired,
The natural gas gas that flow is less reclaims and utilizes, and reduces gas field emptying amount, it is achieved energy-saving and emission-reduction, the most at sea
Gas field later stage well head come atmospheric pressure relatively low time, utilize this low pressure gas pressure charging system to realize supercharging, reach wet gas compressor and enter
The requirement of mouth pressure, extends the offshore gas field construction cycle.
Accompanying drawing explanation
Fig. 1 is offshore gas field conventional gas processing technological flow figure.
Fig. 2 is the schematic diagram of offshore gas field low pressure natural gas recovery system of the present invention.
In figure, each labelling is as follows:
1 offshore platform oil well, 2 test and measuring devices, 3 high-pressure oil gas water separators, 4 low pressure oil moisture traps,
5 condensate surge tanks, 6 wet gas compressors, 7 TEG dehydration systems, 8 residue gas compressor, 9 fuel system,
10 flare vent system, 11 condensate output pumps, 12 low pressure gas coolers, 13 low pressure gas cyclones, 14 low pressure
Gas booster compressor, 15 low pressure gas aftercoolers；
In Fig. 1 and Fig. 2,Represent offshore gas field natural gas flow to；Represent offshore gas field condensation
Oil flows to；Represent that offshore gas field development late stage low pressure well logistics flows to.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings, but the present invention be confined to following example.
As in figure 2 it is shown, the schematic diagram of the offshore gas field low pressure natural gas recovery system provided for the present invention, it includes surveying
Examination metering device 2, high-pressure oil gas water separator 3, low pressure oil moisture trap 4, condensate surge tank 5, dry gas pressure
Contracting machine 8, fuel system 9, low pressure gas cooler 12, low pressure gas cyclone 13, low pressure gas booster compressor 14 and low
Calm the anger aftercooler 15.Test and measuring device 2 is connected with offshore platform oil well 1, test and measuring device 2 by based on
Amount single port well yield.Test and measuring device 2 is connected with high-pressure oil gas water separator 3, high-pressure oil gas water separator
The gaseous phase outlet of 3 is connected with TEG dehydration system 7 and residue gas compressor 8 successively.High-pressure oil gas water separator 3
Oil phase input in low pressure oil moisture trap 4, the gaseous phase outlet of low pressure oil moisture trap 4 successively with dampness pressure
Contracting machine 6, TEG dehydration system 7 are connected with residue gas compressor 8, a part of gas of low pressure oil moisture trap 4
It is directly inputted into mutually in fuel system 9 as fuel.After the oil phase of low pressure oil moisture trap 4 and offshore gas field exploitation
Phase low pressure well logistics flows to input in condensate surge tank 5, the gaseous phase outlet of condensate surge tank 5 successively with low pressure
Gas Cooler 12, low pressure gas cyclone 13, low pressure gas booster compressor 14 are connected with low pressure gas aftercooler 15,
And the outlet of low pressure gas aftercooler 15 is connected with wet gas compressor 6 and fuel system 9 respectively.Condensate surge tank
Oil phase in 5 carries out outer defeated through condensate output pump 11.
The present invention provide offshore gas field low pressure natural gas recovery system be applicable in offshore gas field for collect low-pressure,
The Oilfield Natural Gas Plant of low discharge, it is achieved to low-pressure, the recycling and reuse of low discharge natural gas, reduces offshore oilfield
The emptying amount of middle natural gas；Simultaneously at latter period of oilfield development, it is possible to use this low pressure gas recovery system is directly to well head thing
Stream carries out supercharging, to reach the requirement of wet gas compressor inlet pressure, extends the construction cycle of offshore gas field.
On the central processing platform in certain oil field, south, it is provided with a set of above-mentioned low pressure natural gas recovery process flow scheme,
Natural gas after condensate surge tank is for recycling and reuse: devise a set of can recovery about within the system
56000Sm3The low pressure gas retracting device of/d natural gas, year recovery total about 20,000,000 side, within about about one year, can return
Receiving unit investment cost.
Pressure-fired gas can be compressed by the present invention, adapts to entrance tolerance and changes greatly, can realize single-stage pressure ratio simultaneously
Height, based on above feature, the present invention can realize stable to low pressure gas, long-term recycling, reduces associated gas
Emptying amount, it is achieved energy-saving and emission-reduction.
Present invention is generally directed to the feature that after offshore gas field condensate surge tank, low pressure natural gas pressure is the lowest, flow is little,
It is provided with twin-screw compressor, this portion of natural gas is carried out supercharging so that it is reach wet gas compressor inlet pressure
Require or reach the requirement of offshore gas field fuel gas user's pressure, it is achieved that recovery and the utilization to this association.Double spiral shells
The feature of rod-type compressor is can be compressed pressure-fired gas, adapts to entrance tolerance and changes greatly, can realize simultaneously
Single-stage pressure ratio is high, and based on above feature, the present invention can realize stable to low pressure gas, long-term recycling, reduces
The emptying amount of associated gas, it is achieved energy-saving and emission-reduction.
Simultaneously in the gas field development later stage, when well head gas pressure can not reach the requirement of wet gas compressor inlet pressure, adopt
Carry out gas with well head and be introduced into low pressure gas compressor, then entering wet gas compressor, extending the construction cycle of low-pressure gas well.
Claims (1)
1. an offshore gas field low pressure natural gas recovery system, it is characterised in that: it includes high-pressure oil gas water separator, low pressure oil moisture trap, condensate surge tank, low pressure gas cooler, low pressure gas cyclone, low pressure gas booster compressor, low pressure gas aftercooler, residue gas compressor and fuel system；
The gaseous phase outlet of described high-pressure oil gas water separator is connected with described residue gas compressor；
It is connected a TEG dehydration system between described high-pressure oil gas water separator and described residue gas compressor；
The oil phase outlet of described high-pressure oil gas water separator is connected with described low pressure oil moisture trap；
The gaseous phase outlet of described low pressure oil moisture trap is connected with described fuel system and wet gas compressor respectively；
The oil phase outlet of described low pressure oil moisture trap is connected with described condensate surge tank；
Low pressure well head logistics from offshore gas field inputs to described low pressure oil moisture trap or described condensate surge tank；The gaseous phase outlet of described condensate surge tank is connected with described low pressure gas cooler, described low pressure gas cyclone, described low pressure gas booster compressor and described low pressure gas aftercooler successively；
The outlet of described low pressure gas aftercooler is also connected with described TEG dehydration system；
Described low pressure gas booster compressor is twin-screw compressor.
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| CN201410116454.5A CN103883287B (en) | 2014-03-26 | 2014-03-26 | Offshore gas field low pressure natural gas recovery system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104405361B (en) * | 2014-11-25 | 2017-03-15 | 青岛汇森能源设备股份有限公司 | Skid-mounted type open flow gas recovery system and recovery method |
| CN104895984A (en) * | 2015-06-03 | 2015-09-09 | 温州经济技术开发区滨海志杰机电产品设计工作室 | Zinc alloy union spring type offshore well auxiliary power equipment |
| JP6254645B1 (en) * | 2016-07-19 | 2017-12-27 | 三井造船株式会社 | Gas hydrate recovery system and gas hydrate recovery method |
| CN109138965B (en) * | 2018-10-11 | 2023-11-03 | 中国石油工程建设有限公司 | Slug flow trapping system and method based on low-pressure liquid storage |
| CN112502688A (en) * | 2019-07-19 | 2021-03-16 | 廖文勇 | System and method for realizing mixed transportation and recovery of sleeve gas by multi-phase compression |
| CN111042773B (en) * | 2019-12-21 | 2021-11-12 | 山西晋城无烟煤矿业集团有限责任公司 | Low-pressure coal bed gas well emptying and recycling linkage device |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |
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